full expression의 의미

아래 C 표준을 보면 명확한 표현을 알 수 있습니다.

A full expression is an expression that is not part of another expression or of a declarator. Each of the following is a full expression: an initializer that is not part of a compound literal; the expression in an expression statement; the controlling expression of a selection statement (if or switch); the controlling expression of a while or do statement; each of the (optional) expressions of a for statement; the (optional) expression in a return statement. There is a sequence point between the evaluation of a full expression and the evaluation of the next full expression to be evaluated.

http://port70.net/~nsz/c/c11/n1570.html#6.8

요컨대 다른 표현식이나 선언자의 일부가 아닌 표현식을 완전 표현식(full expression)이라 부릅니다.